Telephone system



Sept. 4, 1923.

- Ms.- B. STAZAK TELEPHONE SYSTEM Filed July '15, 1920 Patented Sept. 4, 1923.

MICHAEL B. STAZAK, or CHICAGO, ILLINOIs, AssIenOn To KnL oGe swrronnoan'n nun SUPPLY cOnPAuY, or onronoo, ILLINOIS, A oonronarron on ILLINOIS.

TELEPHONE sys'rnrvr. 3 O

' Application filed July 15,- 1920. Serial No. 396,545.

To aZZ whom it may concern;

- Be it known that I, MICHAEL B. STAZAK, a citizen of the United States of America, residing at Chicago, countyof Cook, and State of Illinois, and useful Improvements in Telephone Systems, of which the followingis a specifica,

tron.- My invention relates to telephone systems in general and has tojdo more particularly with systems of the type known in the art as magneto or local battery, systems, and an object my invention is the provision of an improved circuit arrangement of the above eharacterwhich will embody desirable features in a simple, eflicient and economical manner. I i a The linesof a; system of the abovecharacter terminate at the exchangerinidrop signals, which signals when actuated upon thednitiation ot a call attract the operators attention so that thesame may be answered. The cord; circuits for interconnecting the lines are provided with clearing out sig nals which operate to attract theoperators attention when disconnection is desired after the termination of conversation. The drop signals for the lines vare located in the face of the board and when one operates-it drops a shutter to attract the Operators attention, giving the operator both a visual and audible signal. When the operator is busy settin up and disconnecting other connections,

she depends largely on the audibility' OI" the chopping shutter, and as this audibility' isnot always marked, delays "frequently happen. The clearing-out signals associated with the cord circuits are alsointheiaform of drops and are also located in the face of the switchboard, lVhen the clearing-out signals are actuated to notify-the operator that disconnection is desired, it frequently happens. that many of the cordsareiin use in establishingconnections thus partly obscuringa clear view ofthe'face of the board, and to :withdraw the cords that were used in the'call that now'desires disconnection the operator must frequently trace at a considerable time lossthe cords associated with the actuated clearing-out signals so that no mistake is'made and the wrong connection taken down. 2 V

To overcome these Objectionable features, I provide for each line a visual signal in the form of a line lamp in; place of the drop have invented certain new disconnect jack J, and 1 signal, which is lighted upon theinitiation of a call, thev sait lamp being associated with an answering jack of itsline. I thus provide answering jacks andsignal lamps only for the lines at the exchanges and the usual multiples associated with answringjacks. I. eliminate the clearing-out drop' signals and in their'place I provide supervisory sig nals in the form of lamps which are located in the keyboard of the switchboard and in alignment; with the answering and calling plugsv of their associatedcord circuit, so. that when conversation is terminated and the currents are transmitted to the exchange from the respective substations," the associated supervisory signals are lighted, giving the operator positivevisualfsig nals, and. even though a plurality. ofcOrds are in the jacks of established connections. The disconnection is simple due to the fact that the two lightedsupervisorydisconnect signals are in alignment with their respective cords, and in full view of the operator, and the operator does-not have to trace the cords to effect disconnection. The features, as above Outlined, as well as others, will bemore fully hereinafter described'in the ensuing specificationg Referring now more in general toniy in-J ventionas illustrated inthe accompanying show a, calling magneto sub the energization of the line re'layto attract' the operators attention. v The hne circuit equipped with theusual local Y J A lineIsignal -,-S associatedwith line circuit L is lighted. upon 7 L-is also equipped with thefusual answering also show thewmultiples J of the :callingfsubstation A, The cord circuit C for interconnecting subscribersjlines comprises an answering plug AP and a calling plug GP, the said pugs beiru connected by the heavily-marked 'italking conductors, having the condensers -K and K? interposed. The answering end-of the cord circuit C comprises aringback key RB, forthe usual purposes, and is also, provided answering supervisory relay f AS, which relay is -energized by disconnect current from the calling substation A. An answering supervisory lamp AL is "associated with with an the answeringend of the cord circuit C and is lighted upon the" actuation of the answering supervisory relay AS to give the operator at the exchange a visual disconnect signal. The calling end of the cord circuit C is provided with a calling supervisory relay CS, energized by disconnect current from the called substation, and a calling supervisory lamp CL is provided, which is lighted upon the actuation of the calling supervisory relay CS to give the operator at the exchange a visual disconnect signal. A listening key LK, when actuated connects the operators set 0 to the cord conductors, and a ringing key BK, when actuated, connects ringing generator G to the cord conductors to signal the called for substation.

To the right of the drawing I have shown a called substation B similar to the calling substation A, 'said'substa-tion' B terminating at the exchange in a line circuit L similar to the line circuit L.

Having described in general the apparatus embodying my invention, I will now describe in detail the operation in establishing a connection between a calling substation and acalled substation.

Assuming now that the subscriber at the calling substation A initiates a call, he opcrates his hand generator HG and removes the receiver from the switchhook. current from the hand generator operates the line relay LR of the line circuit L, said current being traced from the hand generator HG over the line conductor 2, normal contact?) of the line relay LR, through the winding of the relay LB, normally closed contact 4 of the jack J, conductor 5, through the normally closed contact 60f the multiple jack J, the line conductor 7, to the other pole of the hand generator HG. The line relay LR now energizes, and the closing of its make-before-break contact 8 establishes an'energizing circuit, traced from battery, through the closed contact 8,'thro-ugh the winding of the line relay LR, normally closed contacts 4; and 6 of the jacks J and J to ground through the alternate contact 9 of the line relay. The closing of alternate contact 10 ofthe line relay LR establishes an energizing circuit for the line signal S, traced from'battery through thelamp S, conductor'll, to grounded alternate contact 1001 the line relay LR. The operator at the exchange notingthe lighted line signal S,'now inserts the answering plug AP into the jack J of the calling line, and the insertion of the said plug AP into the jack J opens the normally :closed contacts 4 of the said jack J, interrupting the locking circuit of the line relay LR, which now restores, opening its alternate contact 10 to efiace the line signal S. The operator now actuates her listening key'LK to connect her the customary busy signal.

The

operators set Oto thecordconductors and inquires the wants ofthe calling subscriber. A busy potential is placed upon the sleeve of the line jacks when the answering plug" AP is inserted therein,- traced from battery over conductor 12, through the sleeve of the .plug AP to the sleeve of the jack J, so

that, should an operator test the multiple iack'of'the calling line, she would receive Assuming that 'it'is the subscriber at the substation-B that is wanted, she now inserts v the calling plug CP into the multiple jack J 2 of the called line, andthe opening other mally-closed contacts 13 of the jack J r'emoves the substation control of the line relay LR olf'the line circuit L'.-'-. The operator now actuates her ringing key RK to connect theringing generator Gto ring the bell at the called substation B. Thesubscribe! at the-called substation B, in response to the 'ca1l,removes the receiver frornthe' switchhook. The "callingsubscriber at substation A and the'calledfsubscriber at the substation Bare now in conversational circuit, said circuit beingtra'cedover' the heavily marked conductors. The insertion of the calling plug GP int'ofthe 'jack, J of the called line also places a busy potential on the sleeve of the multiple'jacks of'the c'alledf line,'fro1n battery over the conductor 12, to the sleeve of the plug GP, to thesleeve of the m'ultiple'jacks J of the called line. Assuming that the "subscribers have finished conversation, they replace their re ceivers upon their respective 'switchliooksl and actuate their respective handg'enerat'ors HG and HG to give the operator at the. exchange the disconnect signal.

The peration of the hand generator at the calling substation A sends current over the line conductor 2,through the tip contacts of the connected plug AP and jack J, nor

mallyiclosed contact '14- of the ringba'ck key RB, through the upperwinding 15' of the answering supervisory relay AS, back" through normal contact 16 of the ringback key RB,tl1ei1lIlg contacts of the connected plug AP and jacli J, over the-line conductors 7, back to the hand generatorat' the calling substation. The answering supervisory relay AS, energized'by the generator current,

iis,

n'ow closes its alternate contact'17 establishe ing a locking circuit for itself traced from battery, through the" lower winding 18 of the said relay AS, its'alternate 'contactl7,'conductor 19, to ground at the normally closed contacts-200i the listening key LK. The closing of alternate contact 17 of theans'w'ering supervisory relay AS also establishesf'a circuit for the answering supervisory lamp AL, traced from battery. through thes ai'd la1np,"alternate contact 17 of relay 'AS,con-

duct'or 19 to groundat normal contact 20 of "V the listening key LK.

The called subscriber at the substation B now actuating his hand generator HG sends current from the hand generator HG, over line conductor 2, the tip contacts of the connected plug CP and jack J normal contact 21 of the ringing key BK, through the upper winding 22 of the calling-supervisory relayCS, back through normal contact 23 of the ringing key RK, ring contacts of the connected plug CP and jack J over line The closure of alternate contact'24'also establishes a circuit for the calling supervisory lamp CL, traced from battery, through the lamp CL, alternate contact 24 of the relay CS, to ground at the normal contact ofthe-listening key LK. The two supervisory lamps AL and CL are now lighted, giving the operator the disconnect signal and notifying her that the calling and called subscribers have finished their conversation, and she withdraws the answer'- ing plug AP and the calling plug GP from the respective jacks J, J and actuates her listening key LK to open the normally closed contacts 20 of the ringing key LK. This interruption of the normally closed contact 20 opens the locking circuit through the lower windings 18 and 25- of the answering supervisory and callingsupervisory relays AS and CS, the said relays restoring; and the opening of the normally closed contact 20 of the listening key LK also opens the circuit through the answering supervisory lamp AL and the calling supervisory lamp CL, which lamps are now efiaced. The apaaratus that was used in establishin the' l l A connection between-the calling subscriber at the substation A and the called substation B, is now at normal and available for use in establishing other connections.

. While I have described a specific form of invention, I do not wish to be limited to the same as changes and modifications will readily suggest themselves by those skilled in the art, and I therefore, aim to cover all such changes and modifications as come within the spirit and scope of the appended claims.

Having described my invention what I claim as new and desire to secure by United States Letters Patent is:

1. A lamp signal magnetotelephone line circuit including a line relay, multiple jacks for said line, contacts for said jacks, said line relay initially energized by alternating current over the two line limbs and said conwith the line limbs,

tacts of said jacks in series independent of any ground, and a locking circuit for said relay including a portion of one line limb only and said contacts. 1

2. A lamp signal magneto telephone line circuit includinga relay initially actuated by alternating current over the two line limbs and contacts of a plurality of spring ja-cks, a locking circuit for said relay in.-

cluding a portion of one'line limb only, and a jack" contact in said locking circuit adapted to be opened when connection is made with the line. v

3. A magneto multiple switchboard in: cluding a telephone line, a lamp signal therefor at the exchange, and a locking relay to light the signal and contacts of mul tiple jackswhereby the insertion of a plug in any jackof the line will operate contacts of said jack and will serve to put out the lanip signal. v V 4 4. A magneto 'multiple switchboard -including a telephone line, allamp signal therefor,- at the exchange, an alternating current: relay at the exchange to" control said signal, an initialfenergiz'ing circuit for said relay including the two limbs of the line and contacts out a plurality of spring jacks, and a locking circuit for said relay local tothe exchangeincluding said contacts.

5.'A switchboard including a telephone line provided with multiple jacks at the ex- 7 change, the two limbs of the line'normally connected together by a circuit including contacts of a plurality of said jacks, a line relay for the line normally responsive to alternating current and connected in series a pair of locking contacts for said relay, one serving on its energization to connect to one side of a central source of current, the other locking contact servingto connect cluding telephone lines each with relay controlled lamp line signal and spring jacks one side of its winding and a connecting plug adapted 'the other side of the winding'to the other multiply connected and provided with contacts, plugs serving on insertion in the spring jacks toopen said contacts toelface the line signals, cord circuits for interconn cting the lines having each a calling su- &

pe visa y l mp an n ans r ng p r- V s r? ama. an m nua ly Qn mted switch keys fori said circuits for restoring the supervisory lamps to iior nalk '8; A magnetotelephone syste n including a telephone line, an answering jack and as )luralit 1 of multi ale 'acks. a lam si nal ,3 l]. UP tor said l ne a rela 1 o erat ye over the two I r l I limbs of the line and'spr ng contacts of said answering and sa d multiple JflCkSvIII series,

locking circuit for said relay controlled through the spring contacts of said answering and said multiple jacks, and con tacts controlled by said relay for. causing the lighting of said signal, a cord circuit having a connection terminal at each end and adapted to engage any of said multiple jacks, said terminal operating said spring contacts in the-jack to-Lwhichi't is connected.

to cause the de-energization of said relay and the eflaceinent of said lamp. 7 j

In inagnetotelepho-ne system including a relay, multiplejack contacts, a signal lainp,said relay operatiye over the two sides of s arid telephone line and said multiple jack essees cont-acts in series to light said signal lainp, alocliing circuit for said relay includ ng a contacts, and means for operating said mul; tiple jack contacts to permit the restoration of: said, relay and the elfacenient of said lamp signal. a 10. In a telephone system including a telephone line terminating" in a plurality of multiple jacks having spring contacts, a

relay initially energized by an alternating current over thetwo sides of the line and spring contacts. of said'inultiple jacks in series, a locking circuit for said relay including the spring contacts of said multiple jacks; means for, engaging any of said Inul- MICHAEL B. STAZAK. 

